During his congressional testimony last week, Facebook CEO Mark Zuckerberg was asked by Connecticut Democratic Sen. Richard Blumenthal whether he thinks Facebook users should be able to get their hands on all the information the company and advertiser have on them. Zuckerberg told him that Facebook already has a “download your information” tool that “allows people to see and to take out all of the information that Facebook — that they've put into Facebook or that Facebook knows about them.”

Brian Chen is the lead consumer technology writer for The New York Times. He talked with Marketplace host Kai Ryssdal about what he learned when he tried to “see and to take out” information on his own Facebook page. Using the tool that Zuckerberg talked about, he found a list of 500 advertisers that had his contact information, a record of advertisements he’d clicked on and a list of every person he had “unfriended.” Chen said he does not post much on Facebook and he was surprised by how much information it had.

“I thought it was going to be a pretty boring exercise. But once I saw all that stuff, it's kind of like — you know Neo in "The Matrix," once he gets shot and he reawakens, like, he has a rebirth moment and he sees all of the green lines of code everywhere. That's kind of how I feel about having seen my Facebook data. I can't unsee it anymore.”

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Kai Ryssdal is the host and senior editor of Marketplace, the most widely heard program on business and the economy — radio or television, commercial or public broadcasting — in the country. In addition, he joins forces with Marketplace Tech’s Molly Wood to connect the dots on the economy,...